﻿//
//  Monkey Manager
//  Copyright (C) 2012 Victor Tereschenko (aka sibvic)
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//     
// ========================================================================

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ManagerDB.FolderDBFilters
{
    /// <summary>
    /// Filters items by watched property. Supports chain pattern
    /// </summary>
    class WatchedFilter : IFilter
    {
        bool mPassWatchedOnly;
        IFilter mNextFilter;
        public WatchedFilter(bool passWatchedOnly, IFilter nextFilter)
        {
            mPassWatchedOnly = passWatchedOnly;
            mNextFilter = nextFilter;
        }

        bool haveWatchedFile(StoredFile item)
        {
            foreach (FileDescription file in item.Files)
            {
                if (file.Count >= 0)
                    return true;
            }
            return false;
        }

        public bool IsVisible(StoredFile item)
        {
            if (mPassWatchedOnly)
            {
                if (!haveWatchedFile(item))
                    return false;
            }
            else
            {
                if (haveWatchedFile(item))
                    return false;
            }

            if (mNextFilter != null)
                return mNextFilter.IsVisible(item);

            return true;
        }
    }
}
